<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>登录成功</title>
    <style>
        body { display: flex; justify-content: center; align-items: center; height: 100vh; margin: 0; font-family: Arial, sans-serif; background-color: #f0f8ff; }
        .success-container { text-align: center; padding: 2rem 4rem; background-color: white; border-radius: 10px; box-shadow: 0 0 10px rgba(0,0,0,0.1); }
        h1 { color: #4CAF50; }
        .btn { margin-top: 1rem; padding: 0.5rem 1rem; background-color: #4CAF50; color: white; border: none; border-radius: 5px; cursor: pointer; text-decoration: none; display: inline-block; }
    </style>
</head>
<body>
    <div class="success-container">
        <h1>登录成功！</h1>
        <p>欢迎回来，您已成功登录系统。</p>
        <a href="/" class="btn">返回首页</a>
    </div>
</body>
</html>